Detectores de defeitos: desafios em redes móveis sem fio

Abstract

Distributed Systems are characterized by concurrent and decentralized computing, carried out by two or more computers or mobile devices communicating over a network. Today, wireless networks are an alternative to the conventional wire networks, offering the same functionalities and configuration facilities. These networks combine user mobility with its connectivity, opening new application fields. On wireless networks faults are inevitable, but the unwanted consequences can be avoided by proper use of fault tolerance techniques. In fault tolerance detect failures is an important task. A failure detector is nothing more that an algorithm that provides information about monitored nodes or process suspected to be failed. On wireless network the challenge is distinguish node mobility from node failure. The objective of this work is explore the main features of failure detector algorithms designed to wireless networks and cooperate to improve the accuracy of the information provided by failure detector. Thus, we propose a failure detector algorithm that show besides information on the list of its neighbors the total time of failure of the nodes.